Blow-by can harm an aging engine, but a certain amount is normal for most vehicles. Here is how to tell when there's too much ...

Although some maintenance schedules include an interval for replacing the positive crankcase ventilation, or PCV, valve, others may not. In the latter case, a general recommendation is to replace ...

A significant part of these on-road emissions used to come from the crankcase — up to 30%, according to a 1962 study — but thanks to changes in engine design, that's no longer true.

Within the condensing unit, the compressor will often have a heater connected in some way to its bottom section or crankcase. This heater is often referred to as a crankcase heater (see Figures 1 and ...

QUESTION: I have a boat powered with a 5.7 liter V-8 inboard engine. The crankcase hoses that go from the top of the valve covers and vent into the carburetor are always blowing steam. The engine ...

Improper blow-by control can lead to oily breather and valve covers. Is improper control of blow-by gases in your crankcase causing problems in your engine? If any of these questions below sound ...

Every engine has some sort of crankcase breathing system. The internal combustion process creates pressure, some of which makes its way past the piston rings-along with fuel vapors-and into the ...

Positive Crankcase Ventilation—three dirty words, but do they really need to be perceived that way? In general, the PCV system has two main functions: vapor relief and liquid separation.

Where Is the Oil in a Car and What Does it Do? The typical engine has a large oil reservoir (the crankcase) that holds several quarts of oil. The oil is drawn from the crankcase oil pan into a tube ...

The full term we're discussing here is the Positive Crankcase Ventilation valve. This is a small component found between the intake manifold and the valve cover. It's an incredible invention that ...

This article explains what a “PCV” valve is, when to replace it and how to maintain it. “PCV” stands for “positive crankcase ventilation.” A PCV valve is integral to the positive crankcase ventilation ...